Improvement in watch-case springs



A. M. CHURCH.

Improvement in Watch-Case Springs.

Patented Aug. 20, 1872.

UNTTED STATES PATENT OEETGE.

ALBERT M. CHURCH, OF APLE RIVER, ILLINOIS.

liiPROVEMENT iN WATCH-CASE SPRiNS.

Specification forming part of Letters Patent No. dated August 20, 1372.

SPECIFICATION.

To all 'whom 'it may concern:

Be it known that L ALBERT MARION CHURCH, ot' Apple River, in the county ot' J o Daviess and State ot' Illinois, have invented a certain new and useful Improvement in Springs for 'Vatch-Gases, et which the 'following is a specication:

Nature of the Intention.

illy invention consists in so shaping the caselifting spring ot' al Watch that it is rendered double-acting in raising the cover, hy being made elastic at both ends and pivoted near the center, as hereinafter described.

General Description.

In the drawing, Figure l. is a sectional elevation et' a Watch-case with my spring applied thereto; Fig. 2, a vertical cross-section ot' the saine; Fig. 3, a perspective view et' my improved spriu removed from the Watch-case; liig. 4, a similar vier.' ot' the common form ot' sprin A is a Watclrcase of ordinary construction, having he usual spring-catch, a., for retainingthe eo ver B when closed. rEhis cover B is hinged te the case in the ordinary manner. A spring, C, pivoted at c in the space j' of the Watch-case, is provided on one side ot the pivet, with a broad flattened surface, c, having a loop or catch, d, at the end which clasps the middle section b et' the hinge, which supports the leaf B. The spring C, on the opposite side et' the pivot. is gradually tapered into a thin, loroad arm, c', whose plane is at right angles to that oiA the arm c, and bears against the inner periphery of the watch-case, as shown in Fig. 1.

The action et the spring C is similar to that ot' the usual form, shown in Fig. el, with the very important exception that it is double-actin g, the arm c serving as a secondary spring or elastic cushion to throw the cover B open.

The advantages of this over the ordinary form et' springs are impor ant. My double spring admits of a lighter and more graceful form, and at the same time secures the maximuni degree of elasticity in the minimum degree of space. By tiatteniug and tapering the end otl the spring furthest from the hooked point which engages with the cover, I secure a double-action ot' the spring upon the cover, so that springs of much smaller size can he used than heretofore, an advantage of no little value in the construction of Watches, Where economy et' space is such a desideratum. As the elastic parts are made dat, the pressure on the cover is more even, and the spring itself is rendered more durable. Another advantage is that, being elastic at both ends, it will readily conform itself to cases ot' ditierent sizes, thereby saving jewelers considerable time and labor in a great nia-ny instances.

That I claim as my invention, and desire to secure by Letters Patent, is-

The double-acting spring U, 'crnied in one piece, With thin, broad, smooth-surfaced arm o', whose plane is at right angles to that ci' the arm c, which latter arm is formed with the loop d, constructed and operating as herein shown and described.

In Witness whereof I have hereunto signed my name in the presence of two subscribing Witnesses.

ALBERT MARION CHURCH.

Witnesses:

W. G. CEossLEr, M. B. SUTTON. 

